Huawei HCSP-Presales – Data Center Network Planning and Design V1.0 H19-402_V1.0 Exam Dumps: Updated Questions & Answers (April 2026)

In IPv6, the concept of broadcast addresses does not exist , which is a fundamental difference from IPv4. Instead of broadcast, IPv6 uses multicast and anycast to achieve similar communication functions more efficiently. Therefore, statement B is false , as there is no such thing as an IPv6 broadcast address with all bits set to 1.

Statement A is correct: Unique Local Addresses (ULA) are intended for internal communication within a site or organization and are not routable on the public Internet, similar to IPv4 private addresses.

Statement C is also correct: Global Unicast Addresses in IPv6 are globally routable and function similarly to public IPv4 addresses, enabling end-to-end communication across networks.

Statement D is correct as well: Link-local addresses (FE80::/10) are automatically configured and used only for communication within the same local link (e.g., for neighbor discovery and routing protocols).

Huawei data center designs emphasize IPv6’s efficiency and scalability, particularly its elimination of broadcast traffic, which improves network performance and reduces unnecessary load.

In Huawei VXLAN architecture, different gateway types serve distinct roles in tenant communication. The Layer 2 VXLAN gateway is specifically responsible for providing tenant access to the VXLAN network and enabling intra-subnet communication .

A Layer 2 VXLAN gateway (D) connects traditional Layer 2 networks (such as VLAN-based access networks) to the VXLAN overlay. It allows tenant devices or servers to access the VXLAN fabric while maintaining Layer 2 forwarding within the same subnet (same BD/VNI). This means hosts in the same subnet can communicate directly without requiring Layer 3 routing.

In contrast, Layer 3 VXLAN gateways (B) and centralized VXLAN gateways (C) are used for inter-subnet communication , enabling routing between different VXLAN segments. The default VXLAN gateway (A) typically refers to the default gateway IP configured for hosts, which is implemented via Layer 3 gateway functionality.

Huawei CloudFabric design clearly separates Layer 2 access (tenant onboarding and intra-subnet forwarding) from Layer 3 gateway functions (inter-subnet routing) .

Therefore, the correct answer is D (Layer 2 VXLAN gateway) .

In Huawei CloudFabric architecture, a PoD (Point of Delivery) or site is defined as an independent network fault domain under the management of the SDN controller (such as iMaster NCE-Fabric). This design is fundamental for large-scale data center deployments, ensuring clear fault isolation, simplified management, and scalable expansion.

Each PoD typically consists of one or more spine-leaf fabric architectures , which provide high-bandwidth, low-latency, and horizontally scalable connectivity. Within a PoD, all devices operate under a unified control and policy framework delivered by the controller. If a failure occurs within a PoD, it is contained and does not affect other PoDs, thereby improving overall network reliability.

Huawei recommends this modular design approach to support multi-data center deployments, disaster recovery, and service expansion. Multiple PoDs can be interconnected to form a larger cloud fabric, while still maintaining independent fault domains.

Therefore, the statement accurately reflects Huawei CloudFabric design principles and is TRUE.

In Huawei networking, Eth-Trunk (link aggregation) can operate in two modes: manual mode and LACP mode . In manual mode , the Eth-Trunk is statically configured by the administrator, and member interfaces are manually added without using the Link Aggregation Control Protocol (LACP) .

In this mode, all member links that are up are considered active by default , and they simultaneously participate in traffic forwarding and load balancing . Traffic distribution is typically based on hash algorithms (e.g., source/destination MAC or IP), ensuring efficient utilization of available bandwidth.

Unlike LACP mode, manual mode does not perform dynamic negotiation or link state detection between devices. Therefore, it requires consistent configuration on both ends to avoid issues such as loops or traffic blackholing. However, it is simpler and can be useful in controlled environments.

In Huawei data center designs, especially in M-LAG scenarios , LACP is generally preferred for better reliability and fault detection. Still, the statement accurately describes manual mode behavior.

Therefore, the statement is TRUE .

The statement is false due to an incorrect description of in-band management communication .

Huawei iMaster NCE-Fabric indeed supports both in-band and out-of-band deployment modes , but the interfaces used are misrepresented:

In in-band mode , iMaster NCE-Fabric uses southbound interfaces (not northbound) to communicate with switches over the service network . These southbound interfaces are responsible for delivering configurations and collecting device information.

In out-of-band mode , the description is correct: the controller connects to device management interfaces via a dedicated management network , ensuring separation from service traffic.

The confusion arises because:

Northbound interfaces are used for communication between the controller and upper-layer systems (e.g., cloud platforms like OpenStack or ManageOne).

Southbound interfaces are used for communication between the controller and network devices .

Huawei architecture strictly separates these roles to enable clear control-plane layering and automation .

Therefore, because the statement incorrectly mentions northbound interfaces in in-band mode , the correct answer is FALSE .

In Huawei VXLAN architecture, all listed statements accurately reflect core design concepts used in CloudFabric deployments.

A is correct: a Virtual Interface (VBDIF/VirtualIF) is a Layer 3 interface associated with a Bridge Domain (BD) , enabling inter-subnet routing (distributed gateway function).

B is correct: Huawei VXLAN commonly uses a 1:1 mapping between VNI and BD , where the BD acts as the Layer 2 forwarding domain. This mapping ensures clear separation of tenant networks and simplifies forwarding logic.

C is correct: VXLAN encapsulation uses VTEP (VXLAN Tunnel Endpoint) IP addresses . The source IP is the local VTEP, and the destination IP is the remote VTEP. Together, they logically represent the VXLAN tunnel used for transporting overlay traffic across the IP underlay.

D is also correct: a VAP (Virtual Access Point) represents the service access interface. On Huawei CE switches, VAPs are typically implemented using VLAN-based access , meaning VLANs act as the entry point for VXLAN services.

These concepts are fundamental in Huawei EVPN-VXLAN fabrics, enabling scalable, multi-tenant, and automated data center networking.

In Huawei CloudFabric architecture, logical switches are a key abstraction used to simplify network service deployment and management. These logical switches are built on top of VXLAN Layer 2 networks and represent virtualized broadcast domains (similar to VLANs, but more scalable).

Huawei extends the function of these logical switches by integrating distributed Layer 3 gateway capabilities directly into them. This means that each logical switch can provide both Layer 2 connectivity and Layer 3 routing services (commonly referred to as distributed gateways). These gateways are typically implemented on leaf nodes using VXLAN with BGP EVPN as the control plane.

As a result, traffic between subnets can be routed locally at the ingress leaf switch without needing to traverse to a centralized gateway, significantly improving efficiency and reducing latency. Logical ports connected to these logical switches automatically receive gateway services, enabling seamless inter-subnet communication.

This design aligns with Huawei’s intent of decoupling physical and logical networks while providing scalable, agile, and highly efficient data center networking. Therefore, the statement is TRUE.

In Huawei CloudFabric and VXLAN-based data center designs, it is a best practice to use the IP address of a loopback interface as the VTEP (VXLAN Tunnel End Point) source address instead of a physical interface IP. This recommendation is based on reliability, stability, and operational flexibility.

A loopback interface is always in the UP state as long as the device is operational, whereas physical interfaces may go down due to link failures. If a physical interface IP is used as the VTEP source, any link failure would cause VXLAN tunnels to flap, impacting service continuity. In contrast, loopback interfaces remain reachable through the underlay network via dynamic routing protocols such as OSPF, IS-IS, or BGP, ensuring consistent tunnel endpoints.

Additionally, using loopback addresses supports ECMP (Equal-Cost Multi-Path) forwarding in the underlay, improving load balancing and network utilization. Huawei documentation strongly emphasizes this design principle to enhance VXLAN tunnel resilience and simplify network operations. Therefore, the statement is TRUE.

In Huawei CloudFabric architecture, iMaster NCE-Fabric acts as the central network controller and automation platform that directly integrates with server virtualization platforms such as FusionSphere, VMware vCenter, and OpenStack . This integration enables automated network provisioning, policy enforcement, and dynamic resource orchestration between compute and network layers.

Through northbound APIs, iMaster NCE-Fabric communicates with virtualization platforms to obtain tenant, VM, and network information. It then translates these requirements into fabric configurations, such as VXLAN, EVPN, and underlay routing policies. This tight integration is essential for automated service deployment and end-to-end orchestration , which is a core capability in Huawei’s CloudFabric solution.

On the other hand, iMaster NCE-FabricInsight is focused on intelligent O & M, monitoring, and analytics . It provides telemetry-based visibility, fault detection, and performance optimization, but it does not directly connect to or integrate with virtualization platforms for service provisioning.

Therefore, the correct answer is iMaster NCE-Fabric , as it is the component responsible for connecting to server virtualization systems and enabling automation.

Huawei’s Intelligent Lossless Data Center Network is specifically designed to meet the stringent requirements of AI computing workloads , which generate massive east-west traffic and exhibit bursty communication patterns such as incast scenarios . Therefore, traffic control in incast scenarios (A) is a critical requirement to prevent buffer overflow and packet loss.

Fast and efficient load balancing (B) is also essential, as AI training jobs rely on distributed computing across multiple nodes. Technologies like ECMP and flowlet-based load balancing ensure even traffic distribution and optimal link utilization.

Quick congestion control (C) is another key requirement. Mechanisms such as PFC (Priority Flow Control) and ECN (Explicit Congestion Notification) are used in Huawei CloudFabric to achieve near lossless transmission, which is vital for RDMA-based AI workloads.

However, High-performance computing (HPC) (D) is not a network requirement—it is an application and compute domain concept . While AI workloads may run on HPC systems, HPC itself is not a characteristic or requirement of the network.

Therefore, the correct answer is D .